Federal Register / Vol. 88, No. 241 / Monday, December 18, 2023 / Rules and Regulations 87331 

the FAA amends 14 CFR part 39 as 

follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2023–24–01 Airbus Canada Limited 

Partnership (Type Certificate Previously 

Held by C Series Aircraft Limited 

Partnership (CSALP); Bombardier, Inc.): 

Amendment 39–22617; Docket No. 

FAA–2023–2229; Project Identifier 

MCAI–2023–00736–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective January 2, 2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Airbus Canada Limited 

Partnership (Type Certificate previously held 

by C Series Aircraft Limited Partnership 

(CSALP); Bombardier, Inc.) Model BD–500– 

1A10 and BD–500–1A11 airplanes, 

certificated in any category, as identified in 

Transport Canada AD CF–2023–39, dated 

June 6, 2023 (Transport Canada AD CF– 

2023–39). 

(d) Subject 

Air Transport Association (ATA) of 

America Code 28, Fuel. 

(e) Unsafe Condition 

This AD was prompted by a reported 

interference between the pilot valve fittings 

and their mating holes in the rear spar of the 

center wing box. The FAA is issuing this AD 

to address fitting failure, which could lead to 

a failure of its shroud attachment and 

subsequent fuel leak into the area behind the 

rear spar and into the landing gear bay. Such 

significant fuel leak, combined with a 

potential ignition source such as a failure of 

a bleed duct or a failure of wires/connectors 

in these areas, could create a fire hazard on 

the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Requirements 

Except as specified in paragraph (h) of this 

AD: Comply with all required actions and 

compliance times specified in, and in 

accordance with, Transport Canada AD CF– 

2023–39. 

(h) Exception to Transport Canada AD CF– 

2023–39 

Where Transport Canada AD CF–2023–39 

refers to its effective date, this AD requires 

using the effective date of this AD. 

(i) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation Branch, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

In accordance with 14 CFR 39.19, send your 

request to your principal inspector or 

responsible Flight Standards Office, as 

appropriate. If sending information directly 

to the International Validation Branch, send 

it to the attention of the person identified in 

paragraph (j)(1) of this AD. Information may 

be emailed to: 9-AVS-AIR-730-AMOC@

faa.gov. Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or Transport Canada; or Airbus 

Canada Limited Partnership’s Transport 

Canada Design Approval Organization 

(DAO). If approved by the DAO, the approval 

must include the DAO-authorized signature. 

(j) Additional Information 

(1) For more information about this AD, 

contact Gabriel Kim, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; phone: 516–228– 

7300; email: 9-avs-nyaco-cos@faa.gov. 

(2) For Airbus Canada Limited Partnership 

service information identified in this AD that 

is not incorporated by reference, contact 

Airbus Canada Limited Partnership, 13100 

Henri-Fabre Boulevard, Mirabel, Que ́bec J7N 

3C6, Canada; telephone 450–476–7676; email 

a220_

a220world.airbus.com. You may view this 

service information at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 2200 South 216th St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(k) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless this AD specifies otherwise. 

(i) Transport Canada AD CF–2023–39, 

dated June 6, 2023. 

(ii) [Reserved] 

(3) For Transport Canada AD CF–2023–39, 

contact Transport Canada, Transport Canada 

National Aircraft Certification, 159 Cleopatra 

Drive, Nepean, Ontario K1A 0N5, Canada; 

telephone 888–663–3639; email 

TC.AirworthinessDirectivesConsignesdenavigabilite.TC@tc.gc.ca; 

website tc.canada.ca/en/aviation. 

(4) You may view this material at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 2200 South 216th St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(5) You may view this material that is 

incorporated by reference at the National 

Archives and Records Administration 

(NARA). For information on the availability 

of this material at NARA, email 

fr.inspection@nara.gov, or go to: 

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued on November 29, 2023. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2023–27677 Filed 12–15–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1496; Project 

Identifier MCAI–2022–01059–T; Amendment 

39–22619; AD 2023–24–03] 

RIN 2120–AA64 

Airworthiness Directives; MHI RJ 

Aviation ULC (Type Certificate 

Previously Held by Bombardier, Inc.) 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all MHI 

RJ Aviation ULC Model CL–600–2B19 

(Regional Jet Series 100 & 440); CL–600– 

2C10 (Regional Jet Series 700, 701, & 

702); CL–600–2C11 (Regional Jet Series 

550); CL–600–2D15 (Regional Jet Series 

705); CL–600–2D24 (Regional Jet Series 

900); and CL–600–2E25 (Regional Jet 

Series 1000) airplanes. This AD was 

prompted by a determination that 

aircraft maintenance manual (AMM) 

tasks and certification maintenance 

requirement (CMR) tasks are necessary. 

This AD requires revising the existing 

maintenance or inspection program, as 

applicable, to incorporate new or more 

restrictive AMM and CMR tasks. The 

FAA is issuing this AD to address the 

unsafe condition on these products. 

DATES: This AD is effective January 22, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of January 22, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1496; or in person at 

Docket Operations between 9 a.m. and 


khammond on DSKJM1Z7X2PROD with RULES
87332 Federal Register / Vol. 88, No. 241 / Monday, December 18, 2023 / Rules and Regulations 

5 p.m., Monday through Friday, except 

Federal holidays. The AD docket 

contains this final rule, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

Material Incorporated by Reference: 

• For service information identified 

in this final rule, contact MHI RJ 

Aviation Group, Customer Response 

Center, 3655 Ave. des GrandesTourelles, Suite 110, Boisbriand, 

Que ́bec J7H 0E2 Canada; North America 

toll-free telephone 833–990–7272 or 

direct-dial telephone 450–990–7272; fax 

514–855–8501; email thd.crj@

mhirj.com; website mhirj.com. 

• You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety 

Branch, 2200 South 216th St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, 

call 206–231–3195. It is also available at 

regulations.gov under Docket No. FAA– 

2023–1496. 

FOR FURTHER INFORMATION CONTACT: 

Elizabeth Dowling, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 516–228–7300; email 9-avsnyaco-cos@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to all MHI RJ Aviation ULC Model 

CL–600–2B19 (Regional Jet Series 100 & 

440); CL–600–2C10 (Regional Jet Series 

700, 701, & 702); CL–600–2C11 

(Regional Jet Series 550); CL–600–2D15 

(Regional Jet Series 705); CL–600–2D24 

(Regional Jet Series 900); and CL–600– 

2E25 (Regional Jet Series 1000) 

airplanes. The NPRM published in the 

Federal Register on July 19, 2023 (88 FR 

46118). The NPRM was prompted by 

AD CF–2022–42, dated August 8, 2022, 

issued by Transport Canada, which is 

the aviation authority for Canada 

(referred to after this as the MCAI). The 

MCAI states that operators have 

reported frequent flight interruptions 

and high lavatory smoke detector 

removal rates due to the frequent testing 

of the smoke detector self-test switch by 

the flight crew using unsuitable objects. 

The MCAI also states there is a potential 

dormant failure of the lavatory smoke 

detector if the self-test switch check is 

not performed in accordance with 

revised procedures. 

In the NPRM, the FAA proposed to 

require revising the existing 

maintenance or inspection program, as 

applicable, to incorporate new or more 

restrictive AMM and CMR tasks. The 

FAA is issuing this AD to address a 

potential dormant failure of the lavatory 

smoke detector if the self-test switch 

check is not performed in accordance 

with revised AMM or CMR tasks. If 

these maintenance task changes are not 

implemented, and in combination with 

a fire in the lavatory, this may lead to 

a delay in the reaction time to address 

smoke/fire in the lavatory. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–1496. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received a comment from 

Air Line Pilots Association, 

International, who supported the NPRM 

without change. 

The FAA received an additional 

comment from MHI RJ Aviation. The 

following presents the comment 

received on the NPRM and the FAA’s 

response. 

Request To Identify Corrected 

Revisions 

MHI RJ requested that the corrected 

revisions for Aircraft Maintenance 

Manual (AMM) Tasks 26–16–00–710– 

804–A01 and 26–16–00–710–803–A01 

be identified as found in AMM CSP B– 

001, Revision 71. The commenter stated 

that the Maintenance Task Card Manual 

(MTCM) Task Card updates were also 

implemented in AMM Tasks 26–16–00– 

710–804–A01 and 26–16–00–710–803– 

A01, but references to the AMM tasks in 

the proposed AD do not indicate the 

corrected revision. 

The FAA agrees with the requested 

change since it provides a means for 

operators to ensure the revised 

maintenance tasks are included in the 

AMM revision they are using. Therefore, 

figure 1 to paragraph (h) of this AD has 

been changed to specify AMM Rev 68 or 

later approved revisions. 

Conclusion 

This product has been approved by 

the aviation authority of another 

country and is approved for operation in 

the United States. Pursuant to the FAA’s 

bilateral agreement with this State of 

Design Authority, it has notified the 

FAA of the unsafe condition described 

in the MCAI referenced above. The FAA 

reviewed the relevant data, considered 

the comment received, and determined 

that air safety requires adopting this AD 

as proposed. Accordingly, the FAA is 

issuing this AD to address the unsafe 

condition on this product. Except for 

minor editorial changes, this AD is 

adopted as proposed in the NPRM. 

None of the changes will increase the 

economic burden on any operator. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Bombardier 

Temporary Revision 2A–75, dated May 

28, 2020. This service information 

specifies new or more restrictive CMR 

tasks. This service information is 

reasonably available because the 

interested parties have access to it 

through their normal course of business 

or by the means identified in the 

ADDRESSES section. 

Costs of Compliance 

The FAA estimates that this AD 

affects 1,024 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

The FAA has determined that revising 

the maintenance or inspection program 

takes an average of 90 work-hours per 

operator, although the agency 

recognizes that this number may vary 

from operator to operator. Since 

operators incorporate maintenance or 

inspection program changes for their 

affected fleet(s), the FAA has 

determined that a per-operator estimate 

is more accurate than a per-airplane 

estimate. Therefore, the agency 

estimates the average total cost per 

operator to be $7,650 (90 work-hours × 

$85 per work-hour). 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 

section 106, describes the authority of 

the FAA Administrator. Subtitle VII: 

Aviation Programs, describes in more 

detail the scope of the Agency’s 

authority. 

The FAA is issuing this rulemaking 

under the authority described in 

Subtitle VII, Part A, Subpart III, Section 

44701: General requirements. Under 

that section, Congress charges the FAA 

with promoting safe flight of civil 

aircraft in air commerce by prescribing 

regulations for practices, methods, and 

procedures the Administrator finds 

necessary for safety in air commerce. 

This regulation is within the scope of 

that authority because it addresses an 

unsafe condition that is likely to exist or 

develop on products identified in this 

rulemaking action. 

Regulatory Findings 

This AD will not have federalism 

implications under Executive Order 


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Federal Register / Vol. 88, No. 241 / Monday, December 18, 2023 / Rules and Regulations 87333 

13132. This AD will not have a 

substantial direct effect on the States, on 

the relationship between the national 

government and the States, or on the 

distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Will not affect intrastate aviation 

in Alaska, and 

(3) Will not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 14 CFR part 39 as 

follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2023–24–03 MHI RJ Aviation ULC (Type 

Certificate Previously Held by 

Bombardier, Inc.): Amendment 39– 

22619; Docket No. FAA–2023–1496; 

Project Identifier MCAI–2022–01059–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective January 22, 2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all MHI RJ Aviation 

ULC (Type Certificate previously held by 

Bombardier, Inc.) airplanes identified in 

paragraphs (c)(1) through (6) of this AD, 

certificated in any category. 

(1) Model CL–600–2B19 (Regional Jet 

Series 100 & 440) airplanes. 

(2) Model CL–600–2C10 (Regional Jet 

Series 700, 701, & 702) airplanes. 

(3) Model CL–600–2C11 (Regional Jet 

Series 550) airplanes. 

(4) Model CL–600–2D15 (Regional Jet 

Series 705) airplanes. 

(5) Model CL–600–2D24 (Regional Jet 

Series 900) airplanes. 

(6) Model CL–600–2E25 (Regional Jet 

Series 1000) airplanes. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 26, Fire Protection. 

(e) Reason 

This AD was prompted by a determination 

that new or more restrictive aircraft 

maintenance manual (AMM) tasks and 

certification maintenance requirement (CMR) 

tasks are necessary. The FAA is issuing this 

AD to address a potential dormant failure of 

the lavatory smoke detector if the self-test 

switch check is not performed in accordance 

with the revised AMM or CMR tasks. If these 

maintenance task changes are not 

implemented, and in combination with a fire 

in the lavatory, this may lead to a delay in 

the reaction time to address smoke/fire in the 

lavatory. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Maintenance or Inspection Program 

Revision for Model CL–600–2B19 (Regional 

Jet Series 100 & 440) Airplanes 

For Model CL–600–2B19 (Regional Jet 

Series 100 & 440) airplanes: Within 60 days 

after the effective date of this AD, revise the 

existing maintenance or inspection program, 

as applicable, to incorporate the information 

specified in Bombardier Temporary Revision 

2A–75, dated May 28, 2020. The initial 

compliance time is within 12 months after 

the effective date of this AD. 

(h) Maintenance or Inspection Program 

Revision for Other Airplanes 

For airplanes identified in paragraphs 

(c)(2) through (6) of this AD: Within 60 days 

after the effective date of this AD, revise the 

existing maintenance or inspection program, 

as applicable, to incorporate the information 

specified in Figure 1 to paragraph (h) of this 

AD. The initial compliance time for doing the 

tasks is within 12 months after the effective 

date of this AD. 

Figure 1 to Paragraph (h)—AMM task for an 

operational check of the lavatory smoke 

detector (forward and aft) 

(i) No Alternative Actions or Intervals 

After the existing maintenance or 

inspection program has been revised as 

required by paragraph (g) or (h) of this AD, 

no alternative actions (e.g., inspections) or 

intervals may be used unless the actions, and 

intervals are approved as an alternative 

method of compliance (AMOC) in 

accordance with the procedures specified in 

paragraph (j)(1) of this AD. 

(j) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation Branch, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

In accordance with 14 CFR 39.19, send your 

request to your principal inspector or 

responsible Flight Standards Office, as 

appropriate. If sending information directly 

to the manager of the certification office, 

send it to ATTN: Program Manager, 

Continuing Operational Safety, FAA, 

International Validation Branch, 1600 

Stewart Avenue, Suite 410, Westbury, NY 

11590; telephone 516–228–7300. Before 

using any approved AMOC, notify your 

appropriate principal inspector, or lacking a 

principal inspector, the manager of the 

responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or Transport Canada; or MHI 

RJ Aviation ULC’s Transport Canada Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(k) Additional Information 

(1) Refer to Transport Canada AD CF– 

2022–42, dated August 8, 2022, for related 

information. This Transport Canada AD may 

be found in the AD docket at regulations.gov 

under Docket No. FAA–2023–1496. 

(2) For more information about this AD, 

contact Elizabeth Dowling, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@faa.gov. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 


khammond on DSKJM1Z7X2PROD with RULESER18DE23.016</GPH>

Eff ectivity Interval Limitation AMM Task Numbers (CSP B-001 Rev 68 or 

later approved revisions) 

All 3,000 flight hours 26-16-00-710-804-AO 1 

26-16-00-710-803-AOl 
87334 Federal Register / Vol. 88, No. 241 / Monday, December 18, 2023 / Rules and Regulations 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

to do the actions required by this AD, unless 

this AD specifies otherwise. 

(i) Bombardier Temporary Revision 2A–75, 

dated May 28, 2020. 

(ii) [Reserved] 

(3) For service information identified in 

this AD, contact MHI RJ Aviation Group, 

Customer Response Center, 3655 Ave. des 

Grandes-Tourelles, Suite 110, Boisbriand, 

Que ́bec J7H 0E2 Canada; North America tollfree telephone 833–990–7272 or direct-dial 

telephone 450–990–7272; fax 514–855–8501; 

email thd.crj@mhirj.com; website mhirj.com. 

(4) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 216th 

St., Des Moines, WA. For information on the 

availability of this material at the FAA, call 

206–231–3195. 

(5) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit: www.archives.gov/federal-register/cfr/ 

ibr-locations or email fr.inspection@nara.gov. 

Issued on November 29, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–27680 Filed 12–15–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1505; Project 

Identifier MCAI–2023–00246–T; Amendment 

39–22622; AD 2023–24–05] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Bombardier, Inc., Model CL–600–2B16 

(604 Variant) airplanes. This AD was 

prompted by sleeve loops on some 

passenger oxygen mask lanyards that 

had improper crimping and unsealed 

ends. This AD requires an inspection of 

the passenger oxygen mask lanyards and 

replacement of defective oxygen mask 

lanyards. This AD also prohibits the 

installation of affected parts. The FAA 

is issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective January 22, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of January 22, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1505; or in person at 

Docket Operations between 9 a.m. and 

5 p.m., Monday through Friday, except 

Federal holidays. The AD docket 

contains this final rule, the mandatory 

continuing airworthiness information 

(MCAI), any comments received, and 

other information. The address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

Material Incorporated by Reference: 

• For service information identified 

in this final rule, contact Bombardier 

Business Aircraft Customer Response 

Center, 400 Coˆte-Vertu Road West, 

Dorval, Que ́bec H4S 1Y9, Canada; 

telephone 514–855–2999; email ac.yul@

aero.bombardier.com; website 

bombardier.com. 

• You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety 

Branch, 2200 South 216th St., Des 

Moines, WA. For information on the 

availability of this material at the FAA, 

call 206–231–3195. It is also available at 

regulations.gov under Docket No. FAA– 

2023–1505. 

FOR FURTHER INFORMATION CONTACT: 

Gabriel Kim, Aviation Safety Engineer, 

FAA, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to certain Bombardier, Inc., Model 

CL–600–2B16 (604 Variant) airplanes. 

The NPRM published in the Federal 

Register on July 25, 2023 (88 FR 47827). 

The NPRM was prompted by AD CF– 

2023–06, dated February 9, 2023 

(referred to after this as the MCAI), 

issued by Transport Canada, which is 

the aviation authority for Canada. The 

MCAI states the sleeve loops on certain 

passenger oxygen mask lanyards were 

found to have improper crimping and 

unsealed ends. 

In the NPRM, the FAA proposed to 

require an inspection of the passenger 

oxygen mask lanyards and replacement 

of defective oxygen mask lanyards. In 

the NPRM, the FAA also proposed to 

prohibit the installation of affected 

parts. The FAA is issuing this AD to 

address these defective oxygen mask 

lanyards, which could result in no 

oxygen flow to the mask during an 

emergency. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–1505. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received a comment from 

Bombardier. The following presents the 

comment received on the NPRM and the 

FAA’s response to the comment. 

Request for Removal of Certain 

Variants 

Bombardier requested that the 

proposed AD be revised to remove 

reference to 601–3A and 601–3R 

Variants. The commenter stated that the 

proposed AD only applies to Model CL– 

600–2B16 (604 Variant) airplanes 

(Challenger 605 designation). 

Bombardier noted that the airplane 

serial numbers given in Bombardier 

Service Bulletin 605–35–008, dated 

October 28, 2022, and referenced in 

Transport Canada AD CF–2023–06, are 

all Model CL–600–2B16 (604 Variant) 

airplanes. 

The FAA agrees for the reasons 

provided. The FAA revised the 

Summary, Background, and paragraph 

(c) of this AD accordingly. 

Conclusion 

This product has been approved by 

the aviation authority of another 

country and is approved for operation in 

the United States. Pursuant to the FAA’s 

bilateral agreement with this State of 

Design Authority, it has notified the 

FAA of the unsafe condition described 

in the MCAI referenced above. The FAA 

reviewed the relevant data, considered 

the comments received, and determined 

that air safety requires adopting this AD 

as proposed. Accordingly, the FAA is 

issuing this AD to address the unsafe 

condition on this product. Except for 

minor editorial changes, and any other 

changes described previously, this AD is 

adopted as proposed in the NPRM. 

None of the changes will increase the 

economic burden on any operator. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Bombardier 

Service Bulletin 605–35–008, dated 

October 28, 2022. This service 

information specifies procedures for a 

visual inspection of the existing 

passenger oxygen mask lanyards 

installed in the cabin or lavatory oxygen 

box assemblies, and replacement of the 

defective oxygen mask lanyards. The 


khammond on DSKJM1Z7X2PROD with RULES